That is definitely one of my concerns, as well. Especially as most behavioural science findings I have seen show that with each switch of the “on/off” toggle in similar situations, fewer people follow the guidance with less general adherence to the tenets of the guidance.
Which is why I assumed they (wrongly) thought/hoped that mitigation/herd immunity would work as trying to have self isolation/lockdowns on or off for the next 6,12 however months is not going to be pretty.